Simplify. 8/9+(−5/6)1/6 i need the answer in simplest form! these are fractions (one is negative)!asap, and have a spooky halloween : u

Anyone know? will mark brainliest if correct!

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

2x minus y equals 6, x plus y equals negative 3